[QGIS-trac] Re: [Quantum GIS] #2596: One draw too much on switch off

[Quantum GIS]

#2596: One draw too much on switch off
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   Reporter:  aperi2007                         |              Owner:  nobody       
       Type:  bug                               |             Status:  new          
   Priority:  major: does not work as expected  |          Milestone:  Version 1.6.0
  Component:  MapCanvas                         |            Version:  HEAD         
   Keywords:                                    |   Platform_version:  7            
   Platform:  Windows                           |           Must_fix:  No           
Status_info:  0                                 |  
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Comment(by aperi2007):

 I do some tests.
 It happened even with shapefile.

 If I checked the "use cache render" this don't happened.

 It don't happened even if I deselect the "use cache render", but set
 the number of features to draw before updating the display to zero (0).

 In effect it seem happened only when this settings is set to some number
 other than zero.

 Infact I usually use as settings 3000 or 5000 features because I have
 postres with
 some table very big (1.000.000 features and so on).
 And use the 0 setting is unacceptable because it mean wait some minutes
 before to see something (to full-extent).
 I surely prefer set to 5000 features before drawing to have a feedback of
 progress of display-ing.
 But this double redrawing is quite boring.

 Now I test better with the use of caching.


 Replying to [comment:1 pcav]:
 > Does enabling cache improve this significantly?

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Ticket URL: <https://trac.osgeo.org/qgis/ticket/2596#comment:2>
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